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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) | $ 51,553 | $ 51,431 | $ 50,868 | $ 49,976 | $ 50,075 | $ 46,876 | $ 46,215 | $ 45,626 | $ 203,828 | $ 188,792 | $ 181,351
Provision for loan losses | 1,672 | 2,940 | 2,804 | 4,103 | 3,646 | 1,424 | 1,271 | 1,334 | 11,519 | 7,675 | 3,072
Noninterest income | 27,431 | $ 27,927 | $ 26,057 | $ 25,617 | 26,473 | $ 25,324 | $ 28,715 | $ 25,296 | 107,032 | 105,808 | 96,413
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,383 | 11,901 | 11,349
Other expenses |  |  |  |  |  |  |  |  | 179,021 | 173,814 | 172,172
Income before taxes |  |  |  |  |  |  |  |  | 107,937 | 101,210 | 91,171
Total assets | 7,018,952 |  |  |  | 6,692,829 |  |  |  | 7,018,952 | 6,692,829 | 6,574,972
Capital expenditures |  |  |  |  |  |  |  |  | 10,835 | 11,263 | 11,490
Operating Segments [Member] | Metropolitan Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 63,519 | 61,500 | 59,923
Provision for loan losses |  |  |  |  |  |  |  |  | 2,229 | 2,684 | 3,077
Noninterest income |  |  |  |  |  |  |  |  | 16,372 | 16,552 | 13,752
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,341 | 2,273 | 2,216
Other expenses |  |  |  |  |  |  |  |  | 34,130 | 32,942 | 32,300
Income before taxes |  |  |  |  |  |  |  |  | 41,191 | 40,153 | 36,082
Total assets | 2,493,096 |  |  |  | 2,277,870 |  |  |  | 2,493,096 | 2,277,870 | 2,298,828
Capital expenditures |  |  |  |  |  |  |  |  | 1,525 | 3,743 | 1,948
Operating Segments [Member] | Community Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 135,508 | 122,404 | 116,935
Provision for loan losses |  |  |  |  |  |  |  |  | 7,509 | 3,806 | (488)
Noninterest income |  |  |  |  |  |  |  |  | 57,745 | 52,598 | 51,415
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,281 | 7,894 | 7,277
Other expenses |  |  |  |  |  |  |  |  | 96,627 | 91,655 | 89,888
Income before taxes |  |  |  |  |  |  |  |  | 80,836 | 71,647 | 71,673
Total assets | 4,412,174 |  |  |  | 4,379,205 |  |  |  | 4,412,174 | 4,379,205 | 4,113,783
Capital expenditures |  |  |  |  |  |  |  |  | 7,738 | 4,634 | 7,972
Operating Segments [Member] | Other Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 6,132 | 6,798 | 6,155
Provision for loan losses |  |  |  |  |  |  |  |  | 1,653 | 1,176 | 481
Noninterest income |  |  |  |  |  |  |  |  | 29,711 | 33,629 | 28,079
Depreciation and amortization |  |  |  |  |  |  |  |  | 510 | 514 | 522
Other expenses |  |  |  |  |  |  |  |  | 22,216 | 22,308 | 22,304
Income before taxes |  |  |  |  |  |  |  |  | 11,464 | 16,429 | 10,927
Total assets | 83,594 |  |  |  | 128,697 |  |  |  | 83,594 | 128,697 | 145,814
Capital expenditures |  |  |  |  |  |  |  |  | 125 | 121 | 121
Operating Segments [Member] | Executive, Operations & Support [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | (1,331) | (1,910) | (1,662)
Provision for loan losses |  |  |  |  |  |  |  |  | 128 | 9 | 2
Noninterest income |  |  |  |  |  |  |  |  | 75,415 | 72,806 | 69,442
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,251 | 1,220 | 1,334
Other expenses |  |  |  |  |  |  |  |  | 26,375 | 27,221 | 27,998
Income before taxes |  |  |  |  |  |  |  |  | 46,330 | 42,446 | 38,446
Total assets | 803,810 |  |  |  | 624,428 |  |  |  | 803,810 | 624,428 | 679,194
Capital expenditures |  |  |  |  |  |  |  |  | 1,447 | 2,765 | 1,449
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | (72,211) | (69,777) | (66,275)
Other expenses |  |  |  |  |  |  |  |  | (327) | (312) | (318)
Income before taxes |  |  |  |  |  |  |  |  | (71,884) | (69,465) | (65,957)
Total assets | $ (773,722) |  |  |  | $ (717,371) |  |  |  | $ (773,722) | $ (717,371) | $ (662,647)

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